78605040 has 80 divisors (see below), whose sum is σ = 245082528. Its totient is φ = 20840448.

The previous prime is 78605039. The next prime is 78605041. The reversal of 78605040 is 4050687.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78605039) and next prime (78605041).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 78604989 and 78605007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78605041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45472 + ... + 47168.

Almost surely, 2^78605040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78605040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122541264).

78605040 is an abundant number, since it is smaller than the sum of its proper divisors (166477488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78605040 is a wasteful number, since it uses less digits than its factorization.

78605040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906 (or 1900 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 78605040 is about 8865.9483418301. The cubic root of 78605040 is about 428.3677800711.

The spelling of 78605040 in words is "seventy-eight million, six hundred five thousand, forty".